Which of the following is not an attribute used to distinguish protostomes from deuterostomes?

A. origin of mesoderm
B. cleavage pattern
C. presence/structure of coelom
D. fate of blastopore


Ans: C. presence/structure of coelom

Biology & Microbiology

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At about pH 7 in most cells, what happens to the amino R-group on an amino acid?

A) It acts as a base and gains a proton, giving it a positive charge. B) It acts as an acid and loses a proton, giving it a negative charge. C) It is reduced, and tends to act as an electron donor in redox reactions. D) It remains neutral, like water, and does not have a charge.

Biology & Microbiology

Realized niches are larger than fundamental niches

Indicate whether the statement is true or false.

Biology & Microbiology

Which diagram, A or B, corresponds to an “open” circulatory system?

1.A 2.B

Biology & Microbiology

In a comparison of birds and mammals, having four limbs is _____

A) a shared ancestral character B) a shared derived character C) a character useful for distinguishing birds from mammals D) an example of analogy rather than homology

Biology & Microbiology