The midpiece of the mature sperm contains mitochondria that provide metabolic energy for the trip to the egg. Fructose (simple sugar) is used as fuel by the sperm. From where is this fructose secreted?
A) bulbourethral gland B) prostate gland
C) seminal vesicles D) acrosome
Answer: C
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Clownfishes are involved in a symbiotic relationship with:
a. corals. b. anemones. c. pearlfishes. d. sea cucumbers. e. sea fans.
Cyclin-dependent kinases (Cdk's) catalyze the phosphorylation of targeted proteins, a process that
a. decreases the mass of the protein. b. makes the targeted proteins hydrophobic. c. changes the shape and function of the targeted proteins. d. gives the proteins a three-dimensional shape. e. blocks the cell cycle from proceeding.
Keratin and silk are examples of ________, whereas glucose and maltose are examples of ________
A) proteins; carbohydrates B) nucleic acids; lipids C) proteins; lipids D) carbohydrates; proteins
Choose the letter of the best match from the following:A. hotspotB. habitat lossC. edge effectsD. megafaunal extinctionE. extinction vortexAlmost all the large mammals disappeared from North America by about 10,000 years ago.
Fill in the blank(s) with the appropriate word(s).