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WorksheetsMCAS Common Topics
Total questions: 15
Worksheet time: 13mins
Which of the following statements best compares reproduction in viruses with reproduction in single-celled protists?
Viruses reproduce by releasing spores; single-celled protists reproduce by dividing in half.
Viruses require large colonies to reproduce; single-celled protists reproduce as individual cells.
Viruses require the cellular machinery of host cells to reproduce; single-celled protists reproduce on their own.
Viruses form haploid gametes when they reproduce; single-celled protists form diploid gametes when they reproduce.
Maltose is a carbohydrate molecule that provides energy to plants early in their life cycle. Which elements are most common in a molecule of maltose?
carbon and hydrogen
copper and nitrogen
iron and phosphorus
magnesium and sulfur
HD is caused by a mutation passed on from a parent to offspring. The mutation must have occurred in which of the following?
Gamete
Skin cell
Blood cell
Liver cell
What is the primary role of photosynthesis in the carbon cycle?
releasing carbon to the oceans
removing carbon from the atmosphere
transferring carbon from the soil to organisms
transferring carbon from producers to decomposers
Which of the following is most important in classifying two groups of bears into the same genus?
similar diets
similar genes
similar habitat
similar body size
Which of the following is the best evidence that two birds belong to the same species?
The two birds eat the same food.
The two birds have common behaviors.
The two birds are the same size and color.
The two birds mate and produce fertile offspring.
Juniper is a desert plant that produces toxins. Unlike most animals, a type of rodent called Stephen’s woodrat is able to eat juniper plants. The woodrat has special liver enzymes to metabolize juniper toxins.
Which of the following statements best explains why the special liver enzymes became common in the woodrats?
The enzymes allow the woodrats to grow much larger.
The enzymes make the woodrats poisonous to their predators.
The enzymes reduce the genetic diversity and variety of traits of the woodrats.
The enzymes increase the ability of the woodrats to survive and pass on their genes.
In four o’clock plants, the allele for red flower color is incompletely dominant to the allele for white flower color. As a result, plants that are heterozygous for flower color have pink flowers.
If two plants with pink flowers are crossed, what are the expected percentages of phenotypes in the offspring?
0% red, 100% pink, 0% white
25% red, 50% pink, 25% white
50% red, 0% pink, 50% white
50% red, 50% pink, 0% white
Which of the following is the best example of homeostasis?
Heart rate increases when a person exercises.
The chest cavity expands when the diaphragm contracts.
The biceps muscle relaxes when the triceps muscle contracts.
Digestive enzymes are secreted when food enters the stomach.
In a population of rodents, birth rate plus immigration rate is greater than death rate plus emigration rate. Which of the following occurs under these conditions?
The size of the population always increases.
The size of the population always decreases.
The size of the population never changes.
The size of the population never reaches its carrying capacity.
There are many fungus species that live inside plant tissues. What determines whether the relationship between a fungus and a plant is commensalism, mutualism, or parasitism?
where the fungus is located in the plant
how long the fungus survives in the plant
whether the fungus reproduces in the plant with spores, seeds, or runners
whether the effect of the fungus on the plant is neutral, positive, or negative
For many years, biologists disagreed about whether giant pandas are more closely related to raccoons or bears. Which of the following types of evidence was most useful in determining the evolutionary relationship of giant pandas to other animals?
diet
behavior
genetic sequences
anatomical features
An egg cell in a gorilla contains 24 chromosomes. When the egg cell is fertilized, which of the following occurs?
The 24 original chromosomes replicate, resulting in 48 chromosomes in the fertilized egg.
The 24 original chromosomes split at the centromere, resulting in 48 chromosomes in the fertilized egg.
The nucleus of a sperm cell fuses with the nucleus of the original egg cell, resulting in 48 chromosomes in the fertilized egg.
The nucleus of another egg cell pairs with the nucleus of the original egg cell, resulting in 48 chromosomes in the fertilized egg.
Which of the following describes how a large mouse population with high genetic diversity will most likely be affected by a sudden, significant environmental change?
All of the individuals within the population will reproduce at a higher rate, leading to a decrease in genetic diversity.
New traits will arise as a result of new selective pressures in the environment, leading to an increase in genetic diversity.
Only those individuals best adapted to the new environment will survive and reproduce, leading to a decrease in genetic diversity.
Only some individuals will develop traits to help them survive in the new environment, leading to an increase in genetic diversity.
What is the typical path that dietary cholesterol takes through the digestive system, from the mouth to where it is absorbed into the bloodstream?
mouth → esophagus → pharynx → small intestine → stomach
mouth → pharynx → esophagus → small intestine → stomach
mouth → pharynx → esophagus → stomach → small intestine
mouth → esophagus → stomach → pharynx → small intestine
