Blood returning to the mammalian heart in a pulmonary vein will drain first into the

A. vena cava.
B. left atrium.
C. right atrium.
D. left ventricle.
E. right ventricle.


B. left atrium.

Biology & Microbiology

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Chromosomal sex of a fetus with the sex chromosomes XXY is almost always ____________________

Fill in the blank(s) with correct word

Biology & Microbiology

Which organ system includes the pituitary, thyroid, and adrenal glands?

a. endocrine system b. reproductive system c. lymphatic system d. respiratory system e. skeletal system

Biology & Microbiology

This is the more technical term used by scientists to describe the carrier DNA molecule used when cloning genes. 

A. plasmid B. vector C. plastic D. restriction fragment

Biology & Microbiology

For independent assortment of alleles for two different genes to occur, where must the genes be located?

What will be an ideal response?

Biology & Microbiology