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WorksheetsScience Study Guide Exam 3
Total questions: 100
Worksheet time: 50mins
Why is this mechanism not wasteful? Wouldn’t it be better just to produce enough gametes to ensure continuity of the species?
No, producing many gametes increases the chances of successful fertilization and genetic diversity.
Yes, producing fewer gametes is always more efficient for species survival.
No, producing more gametes decreases the chances of genetic variation.
Yes, producing only enough gametes ensures all offspring survive.
Cite at least three other examples of ORP and briefly discuss why this idea is not considered a “strict biological law.”
Examples of ORP include sickle cell anemia, lactose tolerance, and cystic fibrosis; it is not a strict biological law because exceptions exist due to environmental and genetic factors.
Examples of ORP include photosynthesis, mitosis, and meiosis; it is not a strict biological law because it always applies.
Examples of ORP include gravity, inertia, and thermodynamics; it is not a strict biological law because it is a physical law.
Examples of ORP include osmosis, diffusion, and active transport; it is not a strict biological law because it only applies to plants.
Which of the following are characteristics that can be used to reconstruct animal phylogeny without including molecular genetic analysis?
Body symmetry, presence of tissues, type of body cavity
DNA sequence similarities, gene expression patterns, protein structure
Chlorophyll content, photosynthetic rate, root structure
Number of chromosomes, nucleotide composition, codon usage
The function of leghemoglobin in the roots of legumes is to:
bind oxygen to protect nitrogenase during nitrogen fixation
transport sugars from leaves to roots
absorb water and minerals from the soil
provide structural support to root nodules
Which of the following represents the change in chromosome number during the process of fertilization in most animals and plants?
Sperm (n chromosomes) + Ovum (unfertilized egg, n chromosomes) → zygote (2n chromosomes) → multiple subsequent mitosis
Sperm (n chromosomes) + Ovum (unfertilized egg, n chromosomes) → zygote (2n chromosomes) → a single event of meiosis
Zygote (2n chromosomes) → Sperm (n chromosomes) + Ovum (unfertilized egg, n chromosomes) → multiple subsequent mitosis
None of the above
In class, we discussed the diagnosis of the Kingdom Animalia (as described by the Encyclopædia Britannica: Animals are multicellular eukaryotes whose cells are bound together by collagen. They have sperm and form polar bodies in oogenesis. Animals lack semirigid cell walls, and movement is effected through muscle and nerve cells. They usually gain energy from other organisms or their products. Animals are found almost anywhere on Earth where there is life. Let's interpret some aspects of this diagnosis by finding the incorrect conclusion:
A) Animals are mostly dioecious
B) Besides being able to move, animals can be distinguished from other eukaryotic organisms by the absence of cell walls.
C) Nerve cells transmit orders from the central or the peripheral nervous system to muscles, thus allowing the animal to move.
D) Besides collagen, some animal cells are also bound by carbohydrates on glycoproteins.
E) Animals are heterotrophs.
Consider this diagram of the process of gastrulation and answer the questions below: The arrows A and B represent the movement of cells from the animal pole and rapid division forming
the gastrula.
a bilayered gastrula (A).
a trilayered gastrula (B).
All of these options are correct.
None of the above are correct.
What do the arrows A and B represent?
ectoderm.
protoderm.
mesoderm.
endoderm.
None of the above
The embryonic germ layer of tissue in animals that develops into skin and nervous system is the
ectoderm.
protoderm.
mesoderm.
endoderm.
None of the above
The embryonic germ layer of tissue in animals that develops into the digestive tract, and organs derived from the digestive tract, is the
ectoderm.
protoderm.
mesoderm.
endoderm.
None of the above
The embryonic germ layer of tissue in animals that develops into the muscles and reproductive system is the
ectoderm.
protoderm.
mesoderm.
endoderm.
None of the above
What is the difference between animals that exhibit radial versus bilateral symmetry?
Animals with radial symmetry show cephalization, whereas those with bilateral symmetry do not.
Radial symmetry only occurs in round organisms like the sponges, whereas bilateral symmetry is common to all of the more complex animals.
Mirrored arrangement of body components is common with radial symmetry, but not found at all in bilateral symmetry.
Radial symmetry is characterized by the animal having a coelom, whereas bilateral symmetry has no coelom in the animal body.
Body components are arranged around a central axis in radial symmetry but are arranged with a distinct left and right in bilateral symmetry.
Sponges do not have organized tissues and organs. They cannot be classified as having bilateral or radial symmetry. Therefore, sponges are classified as _______ whereas the rest of the animal groups (with tissues), which are called _________.
Eumetazoa, Parazoa
Parazoa, Metazoa
prokaryotes, eukaryotes
Antizoa, Telozoa
None of the above
A fluid-filled body cavity that forms completely within the mesoderm of animals is a
protostome.
deuterostome.
coelom.
gastrula.
blastula.
What is the name of the coelom in an eucoelomate organism, such as mammal?
peritoneal cavity
pericardium
true body cavity
cardiopulmonary system
None of the above
Which of the following does not have a true coelom?
insect
snail
sea star
roundworm
earthworm
Sponges belong to the phylum
Chordata.
Platyhelminthes.
Cnidaria.
Porifera.
Echinodermata.
Corals and jellyfish belong to the phylum containing the
sponges.
flatworms.
cnidarians.
nematodes.
annelids.
Flukes and tapeworms belong to the phylum containing the
cnidarians.
sponges.
flatworms.
nematodes.
annelids.
All of these animals are mollusks except
flatworms.
squids and octopuses.
chitons.
terrestrial snails and slugs.
scallops.
A mollusk that has arms connecting directly to the head of the animal is a cephalopod.
True
False
Leeches and earthworms belong to the Phylum
Echinodermata.
Arthropoda.
Annelida.
Cnidaria.
Mollusca.
Which of the following is not a characteristic of nematodes?
They have a complete digestive tract.
They have bilateral symmetry.
They exhibit cephalization.
They are unsegmented.
They have a coelom.
Spiders, lobsters, mosquitoes, and scorpions belong to the Phylum
Echinodermata.
Arthropoda.
Annelida.
Cnidaria.
Mollusca.
The most successful phylum regarding diversity and number of species is
Platyhelminthes.
Nematoda.
Mollusca.
Arthropoda.
Echinodermata.
Sea cucumbers, star fishes, dollar sands, and sea urchins belong to the phylum
Nematoda.
Echinodermata.
Arthropoda.
Cnidaria.
Mollusca.
Which of the following is not a characteristic of echinoderms?
They have radial symmetry in adults.
They exhibit cephalization.
They have bilateral symmetry in larvae.
They have a complete digestive tract.
They have spiny skin.
In a biology lab you are given a lancelet to dissect. During the dissection you observe a flexible rod extending along its back to its tail. Based on this observation, you can place it in the phylum
Echinodermata.
Arthropoda.
Nematoda.
Chordata.
Cnidaria.
The function of vertebrae is to
protect the brain and nerve cord.
protect the nerve cord and provide attachment points for muscles.
provide attachment points for muscles.
protect the brain.
protect the nerve chord.
An animal that maintains its body temperature by using heat generated from its own metabolism is a(n)
thermophile.
ectotherm.
endotherm.
poikilotherm.
mesophile.
A description of sharks that does not apply to other fish groups is that
they are cartilaginous craniates without jaws.
they have scaleless skin with lateral lines for sensing vibrations.
they are bony with lobe-finned appendages.
they are bony, with ray-finned appendages.
they are cartilaginous craniates with jaws.
Which of the following is an amphibian?
turtle
octopus
coelacanth
lizard
toad
Which of the following is not an example of a mammal?
dolphin
kangaroo
platypus
penguin
whale
Mammals that lay eggs are
monotremes.
marsupials.
placentals.
bats.
birds.
Which of the following is not a characteristic of mammals?
They are endothermic.
They have lungs.
They have an amnion.
They have a two-chambered heart.
They have a skeletal system composed of bone.
The octopus and squid are cephalopods and are members of which group?
Arthropods
Echinoderms
Cnidarians
Mollusks
Amphibians
Use the following information to answer the next five questions: In most species, the female frogs lay their ova (unfertilized eggs) directly in the water as males clasp their back and releases sperm. The fertilized eggs hatch into legless, aquatic tadpoles. Most tadpoles feed on algae and have gills. As they mature, tadpoles develop legs and lungs, lose the tail, and acquire carnivorous tastes. Frogs are in which group?
reptiles
fishes
lancelets
amphibians
crocodiles
Use the following information to answer the next five questions: In most species, the female frogs lay their ova (unfertilized eggs) directly in the water as males clasp their back and releases sperm. The fertilized eggs hatch into legless, aquatic tadpoles. Most tadpoles feed on algae and have gills. As they mature, tadpoles develop legs and lungs, lose the tail, and acquire carnivorous tastes. Frogs have which of the following traits?
endothermic
incomplete digestive tract
jawless
larval respiration with gills, but adult respiration with lungs
cartilaginous skeleton
The primary function of external gills in aquatic animals is to
exchange gases with the water.
relay nerve impulses.
secrete reproductive hormones.
defend against invading microorganisms.
transport blood.
Use the following information to answer the next five questions: In most species, the female frogs lay their ova (unfertilized eggs) directly in the water as males clasp their back and releases sperm. The fertilized eggs hatch into legless, aquatic tadpoles. Most tadpoles feed on algae and have gills. As they mature, tadpoles develop legs and lungs, lose the tail, and acquire carnivorous tastes. 40. Frogs have which of the following traits?
incomplete digestive tract
larval respiration with gills, but adult respiration with lungs
cartilaginous skeleton
jawless
endothermic
Some semi-aquatic reptiles like crocodiles and alligators can spend much of their life on dry land. Which of the following is an example of an adaptation that would allow reptiles to live and reproduce on dry land?
internal fertilization
external fertilization and amniotic eggs
external fertilization
internal fertilization and amniotic eggs
amniotic eggs
Caenorhabditis elegans is a nematode that scientists have shown grows from a single cell into about 1,000 cells, of which the same 80 cells die during development through apoptosis. Studying this process in C. elegans has helped scientists identify the genes that regulate programmed cell death processes in humans. Which of the following statements is supported by this observation?
C. elegans infections in humans trigger cell death in the latter.
C. elegans has the same organs that are present in humans.
C. elegans and humans have a common ancestor.
C. elegans give live birth like humans.
C. elegans share about 83% of their genes with humans.
Which of the following is a trait that mammals and reptiles (including birds) share but that is not present in any other chordate group?
lungs
mammary glands
an amnion
legs
hair
The proposed common ancestor to all animals, shown at the left of the evolutionary tree, was a
plant.
protist.
fungus.
bacterium.
None of the above
Prior to the divergence of animals, an ancestor is proposed to have developed the key shared trait of all animals, the
body form of having true tissues.
embryonic development of the mouth first, from embryonic cells.
presence of a mouth by which to consume nutrition materials.
ganglia or brain cells to control all motion.
body form of multicellularity.
A distinguishing animal trait, let's call it "A," that separates the body forms of the Eumetazoa and the Parazoa is
whether it is the mouth or the anus which forms first from the opening in the developing embryo.
whether the animal must periodically molt in order to grow, or has characteristic soft larval stages.
whether the animal has bilateral symmetry and three germ layers, or radial symmetry and two germ layers.
None of the answer choices are correct.
whether or not the animal has true tissues.
If an animal is an invertebrate, this means that it
does not have true tissues.
does not have a complete digestive tract.
has a complete digestive tract.
has a backbone.
does not have a backbone.
If an animal is a vertebrate, this means that it
does not have a backbone.
has a backbone.
does not have true tissues.
has a complete digestive tract.
does not have a complete digestive tract.
The most successful phylum in regard to diversity and number of species is
Mollusca.
Arthropoda.
Echinodermata.
Nematoda.
Platyhelminthes.
A description of sharks that does not apply to other fish groups is that
they are cartilaginous craniates with jaws.
they are cartilaginous craniates without jaws.
they are bony with lobe-finned appendages.
they have scaleless skin with lateral lines for sensing vibrations.
they are bony, with ray-finned appendages.
Mammals that lay eggs are
marsupials.
bats.
monotremes.
birds.
placentals.
The tendency to concentrate sensory organs and brain at the head end of an animal is called cephalization.
True
False
An animal with an indirect development undergoes a metamorphosis in which larvae do not resemble the adult.
True
False
Roundworms, flatworms, and annelids show radial symmetry.
True
False
Find the mismatched pair
Endocrine system—Creates and releases hormones and other molecules into the bloodstream.
Exocrine system—Substances such as sweat, milk, saliva, etc. are excreted onto body surfaces or body cavities.
Paracrine system—Hormones act nearby the gland where they are produced.
All of the above
None of the above
Molecules known as ________, are produced by glands, travel through the bloodstream, and alter the metabolism of specific target cells.
neurotransmitters
enzymes
pheromones
hormones
pectins
Which of the following is(are) not part of the human endocrine system?
testes
thyroid gland
gallbladder
pancreas
ovaries
Which structure(s) would you identify as having the function of making testosterone?
parathyroid gland
pancreas
adrenal gland
pineal gland
testis
The endocrine gland that controls homeostasis in terms of blood glucose levels is the
parathyroid gland
pancreas
adrenal gland
pineal gland
testis
Which hormone deficiency would lead to a female that is not ovulating?
cortisol
calcitonin
testosterone
epinephrine
follicle-stimulating hormone
What gland might be overactive if a patient is losing bone calcium?
testes
adrenal
thyroid
parathyroid
ovaries
The hypothalamus is both part of the central nervous system and part of the endocrine system.
True
False
Peptide hormones
are typically water-soluble and bind to receptors that extend from the plasma membrane of the target cell.
bind to receptors that extend from the plasma membrane of the target cell.
are typically water-soluble and bind to a receptor in the cytoplasm of a target cell.
bind to receptors in the cytoplasm of a target cell.
are typically lipid-soluble and bind to a receptor in the cytoplasm of a target cell.
If you heard of a newly discovered class of steroid hormones, which property would be most surprising?
They are lipid-soluble.
They alter gene expression.
They bind to a receptor on the surface of the cell.
They are chemically closest to testosterone.
They bind to a receptor inside the cell's cytoplasm or nucleus.
Lipid-soluble steroid hormones are synthesized from
cholesterol.
proteins.
carbohydrates.
nucleotides.
amino acids.
All of the glands in the vertebrate endocrine system are regulated by the
cerebrum and medulla oblongata.
cerebellum and pituitary gland.
pineal gland and pituitary gland.
hypothalamus and pons.
hypothalamus and pituitary gland.
Which hormones are primary endocrine products of the ovaries?
follicle-stimulating hormone and testosterone
progesterone and testosterone
estrogen and progesterone
estrogen and follicle-stimulating hormone
melanocortins and melanocorticotropic hormone
The activity of the melanocorticotropic hormone, based on its etymology (melanos = black or dark, cortex = shell, tropos = to turn), is best described as:
Stimulating the production of dark pigment in the skin
Regulating blood sugar levels
Controlling heart rate
Aiding in digestion
Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) are produced by the
hypothalamus.
pineal gland.
anterior pituitary gland.
pancreas.
posterior pituitary gland.
Which of the following has its primary effect on the brain's pain receptors?
adrenocorticotropic hormone (ACTH)
endorphins
antidiuretic hormone (ADH)
follicle-stimulating hormone (FSH) and luteinizing hormone (LH)
oxytocin
In humans, the hormone prolactin is produced by the ________ and targets the ________.
posterior pituitary; kidneys
posterior pituitary; pancreas
anterior pituitary; mammary glands
posterior pituitary; mammary glands
anterior pituitary; pancreas
The hormone oxytocin is produced by the hypothalamus and stored by the posterior pituitary gland, which also releases it into the bloodstream. Oxytocin binds to receptors in the
kidneys and ovaries.
kidneys and mammary glands.
mammary glands and uterus.
pancreas and uterus.
thyroid and adrenal cortex.
The hormone that promotes conservation of water in the human endocrine system is
oxytocin.
thyroid-stimulating hormone (TSH).
luteinizing hormone (LH).
antidiuretic hormone (ADH).
prolactin.
Which of the following hormones is released by the posterior pituitary gland?
follicle-stimulating hormone (FSH)
oxytocin
thyroid-stimulating hormone (TSH)
insulin
None of the above
A person who lives in an area where food is severely deficient in iodine may have a ________, which presents with a swollen thyroid gland.
diabetes
acromegaly
hepatitis
osteoporosis
goiter
To prevent swollen thyroid glands, many nations add iodine to
soda pop.
milk.
orange juice.
processed meats.
salt.
Which of the following would result in elevated heart rate?
hypoparathyroidism
hyperthyroidism
hypothyroidism
hypoadrenalism
hyperparathyroidism
The hormone that stimulates liver cells to release stored glucose is
insulin.
melatonin.
glucagon.
calcitonin.
aldosterone.
The adrenal glands are found at the top of the
thyroid gland.
kidneys.
liver.
ovaries.
pancreas.
People having severe allergic reactions to bee stings and specific foods should carry with them a self-injectable dose of
penicillin.
insulin.
follicle-stimulating hormone (FSH).
epinephrine.
oxytocin.
If an individual has high blood sugar characterized with insulin resistance, they are diagnosed with
Hyperthyroidism.
hypoglycemia.
goiter.
diverticulitis.
type 2 diabetes.
Insulin is a peptide hormone. Which of the following would occur in an intact muscle cell exposed to insulin?
Intracellular second messenger molecule levels would increase.
Intracellular glucose levels would decrease.
It would secrete glucagon.
It would contract.
Intracellular insulin levels would increase.
Another name given to hormones carrying messages from glands to target tissues or organs is
secondary messengers.
primary messengers.
intracellular signal transduction components.
All of the above
None of the above
Intracellular signaling pathways in eukaryotes form a network called
anabolic pathways
catabolic pathways.
intracellular signal transduction.
All of the above
None of the above
Some athletes abuse anabolic steroids to gain greater muscle mass. What are some long-term harmful side effects of using anabolic steroids?
growth of breast tissue
shrunken testicles
infertility
impotence
All of the above are correct.
Neurotransmitters and hormones never share the same target cells.
True
False
The pancreas produces hormones governing blood glucose, the thyroid releases hormones to control metabolism, and the ovaries and testes provide the sex hormones.
True
False
The gallbladder produces materials which help emulsify fats during digestion in addition to digestive enzymes.
True
False
The pineal gland produces oxytocin, which helps regulate sleep.
True
False
The testes produce the male steroid sex hormone called testosterone.
True
False
The pancreas produces both glucagon and insulin to regulate blood glucose levels.
True
False
The adrenal glands secrete hormones that affect body fluid regulation and how the body responds to stress.
True
False
Seasonal affective disorder, in one of its forms, is due to improper melatonin secretion by the pineal gland.
True
False
Darkness tends to increase production of melatonin by the ______ gland.
adrenal
thyroid
pineal
pituitary
mammary
Epinephrine can act as either a neurotransmitter or a hormone, depending on where it is released and where it is targeted.
True
False
The integration of endocrine and nervous functions in the hypothalamus points to how tightly these two systems work together overall.
True
False
Peptide hormones are usually carried in the blood, are water-soluble, and bind to receptors located on the plasma membrane.
True
False
Steroid hormones generally bind to internal receptors rather than to cell-surface receptors.
True
False
Endorphins are natural pain relievers which help block pain.
True
False
Oxytocin, a.k.a. "the love hormone," affects human physiology in many ways, including:
triggering uterine contractions for childbirth.
Milk production during breastfeeding.
Acting as a neurotransmitter to promote social bonding.
All of the above
None of the above
