GACE Biology 4

Question 1

Which phase of the cell cycle involves DNA replication?

Accepted Answer

S phase

Answer

DNA replication occurs during the synthesis (S) phase of interphase, duplicating each chromosome before cell division.

Question 2

According to the fluid mosaic model, what is the primary component that gives the cell membrane its fluidity?

Accepted Answer

Phospholipid bilayer

Answer

The phospholipid bilayer forms the flexible, fluid matrix of the cell membrane, with proteins and other molecules embedded or attached within it.

Question 3

A teacher is explaining feedback inhibition in metabolic pathways. Which scenario best illustrates this concept?

Accepted Answer

The end product of a biosynthetic pathway inhibits the first enzyme of that pathway

Answer

Feedback inhibition (negative feedback) occurs when the final product of a pathway allosterically inhibits an early enzyme, preventing overproduction.

Question 4

Which kingdom includes organisms that are prokaryotic, lack a nucleus, and can survive in extreme environments such as hot springs and salt flats?

Accepted Answer

Archaea

Answer

Archaea are prokaryotes that uniquely inhabit extreme environments and differ from Bacteria in membrane lipid composition and other molecular features.

Question 5

Which Hardy-Weinberg condition is violated when a small isolated population of deer loses rare alleles simply due to random chance?

Accepted Answer

No genetic drift (large population size)

Answer

Genetic drift — random allele frequency changes — is most pronounced in small populations, violating the Hardy-Weinberg assumption of infinitely large population size.

GACE - Georgia Assessments for the Certification of Educators Practice Test

GACE - Georgia Assessments for the Certification of Educators Practice Test

GACE Biology 4