A bivalent at prophase I contains ________ chromatids

A) three B) eight C) two D) four E) one


Answer: D

Biology & Microbiology

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The most species-rich groups of fungi are those with dikaryotic growth forms

Indicate whether the statement is true or false.

Biology & Microbiology

A nerve cell returns to the resting potential as ______ ions leave the cell

a. sodium b. potassium c. calcium d. chloride e. ammonium

Biology & Microbiology

At which one of the following checkpoints might the cell cycle be halted if all of the DNA has not yet been replicated?

A) G1 B) G2 C) M D) T E) S

Biology & Microbiology

Assume the two E.coli strains shown below are allowed to conjugate. Hfr: pro+, arg+, his+, lys+, met+, ampicillin-sensitive F-: pro-, arg-, his-, lys-, met-, ampicillin-resistant What supplements would you add to glucose minimal salts agar to select for a recombinant cell that is lys+, arg+, amp-resistant?

A) ampicillin, lysine, arginine B) lysine, arginine C) ampicillin, proline, histidine, methionine D) proline, histidine, methionine E) ampicillin, proline, histidine, lysine

Biology & Microbiology