Many prokaryotes secrete a sticky capsule outside the cell wall that __________.
a. serves as protection from host defenses and as glue for adherence
b. protects them from plasmolyzing in a hypertonic environment
c. reacts with the Gram stain
d. is used for attaching cells during conjugation
e. is composed of peptidoglycan, modified sugars cross-linked by short polypeptides
Answer: a. serves as protection from host defenses and as glue for adherence
You might also like to view...
Penicillin-binding proteins
A. primarily function in the cell to bind to beta-lactam drugs. B. are enzymes. C. are involved in cell wall synthesis. D. inhibit non-growing bacteria. E. are enzymes AND are involved in cell wall synthesis.
Which of the following is not a potential advantage of most types of asexual reproduction in wild plant species?
1.clones are well suited to the environment that the parent inhabits
2.lack of variation that enhances the odds for survival when environmental conditions change
3.rapid colonization of disturbed habitats
4.requires less energy than producing flowers and seeds
A mutation occurs in a gene that encodes a G1 cyclin, such that the protein is unable to bind to its CDK. How will this affect the cell cycle?
A. The cell will rapidly replicate its DNA and progress through mitosis, causing uncontrolled cell division, and leading to cancer. B. The cell will replicate its DNA, but will be unable to progress through mitosis. C. The cell will proceed thru mitosis without replicating its DNA. D. The cell will proceed to the S phase, and DNA repair enzymes will repair the mutated cyclin when it replicates the DNA. E. The cell will be stuck in G1 and will not advance through the cell cycle.
There is no point to taking antibiotics for a cold.
Answer the following statement true (T) or false (F)