Which of the following directors of embryonic development can be found within unfertilized eggs of protostomes?

A. mRNAs transcribed from embryonic genome
B. bindin proteins
C. tissue-specific proteins
D. cytoplasmic determinants


Answer: D. cytoplasmic determinants

Biology & Microbiology

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Within the peptidoglycan layer, the crossbridges that connect the chains of alternating sugar molecules extend between _______ .

a) two N-acetylmuramic acid molecules b) an N-acetylmuramic acid and an N-acetylglucosamine c) two glucose molecules d) two N-acetylglucosamine molecules

Biology & Microbiology

Which of the following is true about genetically modified foods?

a. They have been genetically altered by adding genes from an alternate organism. b. All of their genes have been sequenced, so their entire genome is known. c. Portions of their DNA have been manipulated, and genes have been moved to different chromosomes. d. They have undergone natural selection, and some important genes have been inserted

Biology & Microbiology

The milk-producing glands of mammals are called ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Gram-negative bacteria in the genus ________ prey on other Gram-negative bacteria

A) Bdellovibrio B) Chlamydia C) Rickettsia D) Mycoplasma E) Caulobacter

Biology & Microbiology