In all vertebrates with four-chambered hearts, the ________ receives oxygenated blood directly from the ________.

A. left ventricle, left atrium
B. left ventricle, lungs
C. right ventricle, right atrium
D. right ventricle, lungs
E. left atrium, left ventricle


A. left ventricle, left atrium

Biology & Microbiology

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Which of the following exert bottom-up control?

A. a parasite that resides in a mammal's gut B. a tertiary predator with fluctuating population size C. levels of calcium and nitrogen in the soil D. a disease-carrying protist

Biology & Microbiology

Chimpanzees are considered to be our closest extant relative because  

A.  they have prehensile tails. B.  their genome is 99% identical to the human genome. C.  their upper/lower limbs equally account for bearing the body weight. D.  they have flat, spreading noses. E.  they are a highly social species.

Biology & Microbiology

Copy number variants

A) are extremely rare, occurring in only about a dozen sites in the genome. B) are found only in even-numbered chromosomes. C) number in hundreds to thousands. D) are five or fewer bases long.

Biology & Microbiology

The physical expression of these alleles in an individual is called the _______.

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

Biology & Microbiology