GACE Biology 3

Question 1

In the light-dependent reactions of photosynthesis, which molecule serves as the primary electron donor, releasing oxygen as a byproduct?

Accepted Answer

Water

Answer

Water molecules are split by photosystem II (photolysis), donating electrons to replace those lost by chlorophyll and releasing O₂ as a byproduct.

Question 2

Which of the following best describes the role of transfer RNA (tRNA) during translation?

Accepted Answer

Delivers specific amino acids to the ribosome based on codon-anticodon matching

Answer

tRNA molecules carry specific amino acids and use their anticodon loops to recognize complementary codons on mRNA, ensuring correct amino acid incorporation.

Question 3

A species of fish living in a deep ocean trench has evolved bioluminescent lures. This is an example of which evolutionary concept?

Accepted Answer

Convergent evolution

Answer

Convergent evolution occurs when unrelated organisms independently evolve similar traits in response to similar environmental pressures, such as luminescent lures in different deep-sea lineages.

Question 4

Which level of protein structure is maintained primarily by hydrogen bonds between backbone amino and carbonyl groups, producing alpha helices and beta sheets?

Accepted Answer

Secondary structure

Answer

Secondary structure refers to local folding patterns (alpha helices and beta sheets) stabilized by hydrogen bonds between backbone peptide groups.

Question 5

Which type of symbiosis describes a relationship in which one organism benefits and the other is neither harmed nor helped?

Accepted Answer

Commensalism

Answer

Commensalism describes a symbiotic relationship where one species benefits while the other experiences no significant positive or negative effect.

GACE - Georgia Assessments for the Certification of Educators Practice Test

GACE - Georgia Assessments for the Certification of Educators Practice Test

GACE Biology 3