A cyclin _____
A) is present in similar concentrations throughout the cell cycle
B) is activated by binding to microtubules
C) decreases in concentration when MPF activity increases
D) activates a Cdk molecule when it is in sufficient concentration
E) activates a Cdk when its concentration is decreased
Answer: D
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Recent molecular research shows that plant responses to stress involve the same chemical steps as
______ responses to stress.
a. fungal b. amphibian c. algal d. human e. bacterial
Matching. Choose the one most appropriate answer
for each. 1. ___ adrenal cortex 2. ___ adrenal medulla 3. ___ anterior lobe of pituitary 4. ___ exocrine glands 5. ___ glandular epithelium in gastrointestinal tract 6. ___ gonad 7. ___ hypothalamus 8. ___ pituitary 9. ___ kidneys 10. ___ pancreatic islets 11. ___ parathyroid gland 12. ___ pineal gland 13. ___ posterior lobe of pituitary 14. ___ thymus gland 15. ___ thyroid gland A. secretes one hormone that increases the metabolic rate and another that inhibits calcium release from bone storage sites B. secrete insulin and glucagon C. secretes hormones that prepare accessory reproductive structures for reproduction D. involved in lymphocyte maturation E. secretes tropic hormones, growth hormone, and prolactin F. secretes mineralocorticoids and glucocorticoids G. in many vertebrates, helps to determine the amount and distribution of dark pigments in the skin H. secrete enzymes that help to form angiotensin I. participates in reproductive physiology and responds to photoperiod change J. releases oxytocin and antidiuretic hormone into bloodstream K. secretes a hormone that promotes calcium release from bone storage sites L. produces oxytocin and antidiuretic hormone M. secretes cholecystokinin, secretin, and gastrin N. secretes epinephrine and norepinephrine O. secrete pheromones, milk, tears, sweat, and mucus
Microbes with _____infectious doses are usually more virulent
Fill in the blank(s) with the appropriate word(s).
The carbohydrate in DNA is
A) ribose. B) deoxyribose. C) glucose. D) phosphate. E) cellulose.