OAT Biology Practice Test 2023 Questions and Answer

All of the following are components of the Cell Theory EXCEPT the idea that

Which of the following activities occurs in the Golgi apparatus?

A researcher treats a solution containing animal cells with ouabain, a substance that interferes with the Na+ /K+ pump embedded in the cell membrane and causes the cell to lyse. Which of the following statements best explains ouabain’s mechanism of action?

Prokaryotic cells and eukaryotic animal cells both have

Which of the following is NOT true about pyrimidines and purines?

Which model of DNA replication describes one parental strand and one new strand of DNA making up each new helix?

In glucose catabolism

Fatty acids enter the degradative pathway in the form of

Which of the following is LEAST likely to occur during oxygen debt?

Which of the following is true of the dark reactions of photosynthesis?

A woman with blood genotype IAi and a man with blood genotype IBi have two children, both type AB. What is the probability that a third child will be blood type AB?

In humans, the allele for black hair (B) is dominant to the allele to brown hair (b), and the allele for curly hair (C) is dominant to the allele for straight hair (c). When a person of unknown genotype is crossed against a straight- and brown-haired individual, the phenotypic ratio is

25% curly black hair
25% straight black hair
25% curly brown hair
25% straight brown hair

What is the genotype of the unknown parent?

Assuming classical Mendelian inheritance, how can one differentiate between a homozygous dominant individual and one who is heterozygous for the dominant trait?

If a male hemophiliac (X^hY) is crossed with a female carrier of both color blindness and hemophilia (X^c X^h ), what is the probability that a female child will be phenotypically normal?

Homologous structures are

As the ocean became saltier, whales and fish independently evolved mechanisms to maintain the concentration of salt in their bodies. This can be explained by

Which of the following was NOT a belief of Darwin’s?

The proposed “primordial soup” was composed of organic precursor molecules formed by interactions between all of the following elements EXCEPT

What is the role of histamine in the immune response?

What type of cell responds to activated MHC II complexes?

Which of the following statements best characterizes an axon?

The all-or-none law states that

When the potential across the axon membrane is more negative than the normal resting potential, the neuron is said to be in a state of

Chemical X is found to denature all enzymes in the synaptic cleft. What are the effects on acetylcholine if chemical X is added to the cleft?

During muscle contraction, which of the following regions decrease(s) in length?

Region 1 refers to

When a muscle is attached to two bones, usually only one of the bones moves. The part of the muscle attached to the stationary bone is referred to as

This Question is refer to the following types of muscle:

I. Cardiac muscle
II. Skeletal muscle
III. Smooth muscle

Which type of muscle has strong, forceful contractions?

Which of the following statements concerning growth hormone is NOT true?

Which of the following correctly describes the order of maturation of a sperm?

Which of the following developmental stages has the greatest nuclear-to-cytoplasmic material ratio?

What is NOT true about niches?

Select the proper progression of the taxonomy classification system.

Which is NOT a type of worm?

Red-green color blindness is an X-linked trait. What is the probability that a mother that is heterozygous for this trait and a father with this trait will have affected children?

A population of pea plants has 25% dwarf plants and 75% tall plants. The tall
allele, T, is dominant to dwarf (t). What percentage of tall plants is heterozygous?

Auxin stimulates stem elongation and is involved in the process of phototropism. If plants bend toward a light source, in which region of the plant is auxin most likely to be found?

Hemophilia is a sex-linked trait. From which parent(s) did an affected boy inherit the trait?

Which is NOT a region of a marine biome?

Which of the following is NOT true about the nitrogen cycle?