Name the labeled structures of the virus pictured in this figure. 
A: ________B: ________C: ________D: ________E: ________
What will be an ideal response?
A: fiber protein
B: fiber
C: protein subunit
D: nucleic acid (DNA or RNA)
E: capsid
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It is possible to make a form of nitrogen that is useable by plants; however, the major drawback to this process is:
A. time involved. B. getting enough nitrogen. C. cost of converting nitrogen to a useable form. D. temperatures must be extremely high. E. it is difficult to contain the end product.
If Ca+2 levels in the blood are too low, hormones from the parathyroid gland can induce bones to dissolve and release calcium.
Answer the following statement true (T) or false (F)
The organ system that protects the underlying tissues from abrasion, prevents dehydration, and aids in regulating body temperature.
A) Muscular
G) Respiratory
B) Reproductive
H) Skeletal
C) Digestive
I) Nervous
D) Cardiovascular
J) Endocrine
E) Integumentary
K) Lymphatic
F) Urinary
In humans, nitric oxide is an important gaseous neurotransmitter. Nitric oxide is synthesized by three isoforms of nitric oxide synthase (NOS). What would be a likely effect if a male were missing the gene that codes for one of the NOS isoforms?
A. He would be unable to produce all the liquid components of semen. B. He would have a low sperm count due to decreased spermatogenesis. C. He would have high levels of mutation within his mature sperm. D. He would have difficulty getting and/or sustaining an erection.