Which of the following statements about Gram-negative bacteria and Gram-positive bacteria is true?
a. Only Gram-positive bacteria have a double layer of plasma membrane.
b. Gram negative bacteria have much thicker cell walls than Gram-positive bacteria.
c. Gram-positive bacteria have no plasma membrane, only a cell wall.
d. Gram-negative bacteria are surrounded by a thin cell wall beneath an outer membrane.
Answer: c. Gram-positive bacteria have no plasma membrane, only a cell wall.
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Use the following information to answer the following question(s): You wake up one morning feeling slightly under the weather. A close family member enthusiastically suggests that you take some Echinacea, an herb commonly used as a cold remedy. You then decide to design an experiment to test Echinacea and see if this claim is true. You think, "If taken at the beginning of a cold, Echinacea will reduce cold symptoms."You decide to test the effects of Echinacea on 100 people who are experiencing similar cold symptoms. Which of the following groups would represent an appropriate control in your experiment?
A. 100 sick people given tablets similar to Echinacea but with no herb B. One healthy person given Echinacea tablets C. One sick person given Echinacea tablets D. 100 healthy people given tablets similar to Echinacea but with no herb
Meiosis proceeds different in males compared to females. Which of the following best describes one of those differences?
A. The haploid cells produced by spermatogenesis are genetically diverse from the original parent cell and the haploid cells produced by oogenesis are genetically identical to the original parent cell. B. Spermatogenesis occurs in the ovaries and oogenesis occurs in the testes. C. Spermatogenesis results in the production of four haploid sperm cells and oogenesis results in the production of a single haploid egg cell. D. Spermatogenesis produces haploid cells and oogenesis produces diploid cells. E. Spermatogenesis begins while the man is still a fetus, but oogenesis does not begin until after a woman reaches puberty.
Park officials needed to repair the old mill dam in a state park and so had to drain the pond behind it, killing all the animals and many of the plants in the water
After the pond reformed and many years passed, a certain species of fish established itself in the pond and remained there for more than 400 years. Which most directly describes the role of that type of fish? A) climax species B) pioneer C) producers D) invaders
The blastopore forms during gastrulation
Indicate whether the statement is true or false