CSET CSET Subtest II Life Sciences 2

Question 1

Which organelle is responsible for synthesizing proteins in a eukaryotic cell?

Accepted Answer

Ribosome

Answer

Ribosomes are the sites of protein synthesis, translating mRNA into polypeptide chains.

Question 2

During meiosis, crossing over (recombination) occurs at which stage?

Accepted Answer

Prophase I

Answer

Crossing over occurs during Prophase I when homologous chromosomes pair up and exchange segments.

Question 3

Which type of symbiotic relationship benefits one organism while the other is unaffected?

Accepted Answer

Commensalism

Answer

Commensalism describes an interaction where one species benefits and the other is neither helped nor harmed.

Question 4

What is the primary role of decomposers in an ecosystem?

Accepted Answer

Break down dead organic matter and recycle nutrients

Answer

Decomposers such as bacteria and fungi break down dead organisms, returning nutrients to the soil.

Question 5

In a DNA double helix, adenine always pairs with which nitrogenous base?

Accepted Answer

Thymine

Answer

Adenine pairs with thymine in DNA via two hydrogen bonds (Chargaff's rules).

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