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WorksheetsBiology Olympiad Diagnostic 1.22
Total questions: 16
Worksheet time: 13mins
What provides the best evidence for the independent origin of microphylls and megaphylls?
Microphylls have a branching vascular system, while megaphylls have a single unbranched vein
Microphylls are small, while megaphylls are larger
Both appear as lateral appendages
Microphylls have a single unbranched vein, while megaphylls have a branching vascular system
If you extract the genetic material of the Bacteriophage (X174), you will find that its composition is 25% A, 33% T, 24% G, and 18% C. How would you interpret these results?
The experiment's results must be erroneous; something went wrong
Because the %A does not equal the %T, nor does the %G equal the %C, the DNA must be single-stranded; It replicates by synthesizing a complementary strand and uses the double-stranded form as a template
Bacteriophage (X174) is an RNA virus
We could admit that the %A approximately equals that of T, and the same is true for C and G. Consequently, Chargaff's rules are followed and the DNA is double-stranded
Which of the following terms describes the closing of leaves or flowers at night?
Nocturnal Opening
Seismonasty
Nyctinasty
Thigmonasty
A new therapeutic drug can treat the symptoms of the demyelinating disease multiple sclerosis (MS) by blockage of voltage-gated potassium channels. Neuron action potential conduction improves because:
Less potassium is allowed to leave the axon which increases the size and duration of the action potential
Less potassium is allowed to leave the axon which prevents the inactivation of voltage-gated sodium channels increasing the amplitude of the action potential
More potassium is allowed to enter the axon which increases the amplitude of the action potential
The resistance of the plasma membrane decreases which increases the amplitude of the action potential
Which of the following cellular proteins make direct contact with chromosomes?
Centrosomes and microtubule-associated proteins
Kinesins, myosins, and actin microfilaments
Histones, condensins, and synaptonemal complexes
None of the above
The presence of which of the following amino acids in the channel region of aquaporins contributes to the electrostatic selectivity to allow water, but not other molecules, to pass through?
Leucine
Asparagine
Proline
Tryptophan
Which of the following is a primary organ or structure of the immune system?
Spleen
Lymph Nodes
Tonsils
Thymus
Which statement about the life cycle of the human immunodeficiency virus (HIV) is most accurate?
The viral glycoproteins that coat the mature virion's lipid envelope's outer surface are synthesized by host cell ribosomes in the cytosol.
The mature virus particle does not contain reverse transcriptase; the protein is translated from the RNA genome after entry into the host cell.
If a scientist were to extract just the viral genome from HIV virions and inject the nucleic acid into a human cell, the genome would integrate as a provirus into the host’s genome
In HIV positive individuals, HIV provirus can be found latent in CD4 positive cells years after initial infection
In order to study the effects of certain hormone deficiencies, you inject a mouse with a tyrosine hydroxylase inhibitor. Since tyrosine hydroxylase is the rate-limiting step in the synthesis of catecholamines, which one of the following hormones do you expect to NOT be affected:
Serotonin
Epinephrine
Dopamine
Norepinephrine
Which of the following best represents the type of mimicry characteristic of multiple poisonous butterflies having similar coloration?
Mertensian mimicry
Mullerian mimicry
Batesian mimicry
Wasmannian mimicry
Which of the following statements is correct about diversity in ecological environments?
. Ecological stress increases diversity.
Animals that share a common habitat are typically more closely related than animals in different environments.
Natural selection generally decreases diversity.
Diversity is most often seen in small populations.
You are pleasantly enjoying your afternoon in Bali, Indonesia, when you stumble upon a street stand that has a conspicuous “DO NOT TOUCH” sign. Below the sign, there are two bats. This scary tourist trap owes its existence to which mammalian order?
Monotremata
Chiroptera
Rodentia
Lagomorpha
You have designed a 15 base-pair long degenerate primer (sequence: CATCATCATMAAGCM). The Ms represent base pairs which can either be A or C. You will be using these primers for binding within a genome of 2*10^9 base pairs. What is the expected number of binding sites for your primers?
7
70
700
7000
Botanist Grace is attempting to determine the identity of a plant. She masterfully sections the leaves, and through a light microscope observes that the vessels have a thick layer of concentric mesophyll tissue around them. Which of the following plants could this most likely be?
Chard
Crabgrass
Kale
Rutabaga
Which of the following statements regarding vitamins and minerals is incorrect?
Essential minerals must be consumed in the diet.
Vitamins are organic substances.
Vitamins are important sources of energy for the body
. Iron, Fluorine, Calcium, and Sodium are all minerals
Psoriasis is a skin disorder that is caused by the increased proliferation of skin cells and results in red, itchy skin. Skin cells from a mouse model for this disease are isolated and cultured in a plate containing a drug that promotes the supercoiling of DNA. Which enzyme does this drug inhibit?
DNA polymerase
Helicase.
Topoisomerase.
Primase
