Femaleness or maleness is genetically set at

A) gamete formation.

B) fertilization.

C) the embryonic period.

D) the fetal period.


B) fertilization.

Biology & Microbiology

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Approximately two billion years ago, ________ were primarily responsible for initially oxygenating Earth

A) algae B) Archaea C) cyanobacteria D) purple sulfur bacteria

Biology & Microbiology

During the M checkpoint, the cell ____

a. proceeds to interphase and completes DNA replication b. proceeds to G2 phase and the cell prepares to divide c. proceeds to S phase or enters inactive G0 state d. monitors attachment of spindle fibers to chromosomes e. monitors completion of DNA synthesis and DNA damage

Biology & Microbiology

A ____ individual is always part of a testcross

a. heterozygous b. homozygous recessive c. homozygous dominant d. self-fertilized e. dihybrid

Biology & Microbiology

Given a log phase bacterial culture with 1 x 106 cells per ml and a generation time of 30 minutes, how long does it take the culture to reach a density of 6.4 × 107 cells per ml?

A. 1 hour B. 2 hours C. 3 hours D. 4 hours

Biology & Microbiology