When Ca2
+ diffuses into the cytoplasm of muscle cells and initiates the crossbridge cycle, the animal is
most likely stressed.
Indicate whether the statement is true or false.
F
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What is a defective phage?
A. A virus that has lost some of its genetic material, and therefore cannot infect a new target cell B. A virus that has lost some of its genetic material, and therefore cannot replicate within a new target cell C. A virus that lacks the ability to replicate independently of its host cell D. A virus that cannot attach to its host cell
Which of the following statements is the most accurate description of fruits and seeds?
A. "Fruits" and "seeds" are synonymous terms. B. Fruits always have fleshy coverings, while those of seeds are always hard. C. Fruits are structures that contain seeds and foster seed dispersal. D. Fruits contain endosperm but seeds do not. E. Fruits are produced only by angiosperms and seeds are produced exclusively by gymnosperms.
What allows mammals to process a wider variety of foods than other vertebrates?
a. They have two types of teeth. b. They have four types of teeth. c. They have jaws. d. They have larger mouths. e. They have sharper teeth.
Plants produce large amounts of ________ that serve as an _____________
Fill in the blank(s) with the appropriate word(s).