The matching nucleotide base pairs in DNA are bound to one another by__________ bonds.
A) covalent
B) ionic
C) peptide
D) hydrogen
Answer: D) hydrogen
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Two muscle groups that oppose the action of each other include flexors and extensors, like the biceps and triceps. These muscle groups are known as:
A. agonists B. antagonists C. synergists D. contragonists
Adipose tissue cells are filled with:
a. minerals b. fat c. cartilage d. fibers e. muscles
Which of the following statements is false?
A) There are more than 60 different kinds of amino acids present in cells. B) The R group of amino acids differs from one amino acid to another. C) Only around 20 amino acids are used in protein synthesis. D) Equal amounts of D- and L-amino acids are found in cells. E) An amino acid has an N-terminus, a C-terminus, and an R group.
Upon closer inspection of the leaves of "flower of stone," one can observe tiny, cone-like structures. Each cone-like structure emits spores of two different sizes
Further investigation also reveals that the roots of "flower of stone" branch only at the growing tip of the root, forming a Y-shaped structure. Based on these additional observations, which of the following can be properly inferred about "flower of stone"? 1. It is heterosporous. 2. It is a fern. 3. The cone-like structures are sori. 4. It is a lycophyte. 5. It has separate male and female gametophytes. A) 1 and 5 B) 2 and 3 C) 1, 2, and 3 D) 1, 4, and 5