Which of the following is a correct pair based on their shared characteristics?

a. Earth and a closed system
b. the universe and an open system
c. an ocean and a closed system
d. an ocean and an isolated system


Ans: a. Earth and a closed system

Biology & Microbiology

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In the image above, the substance indicated as

"B" is a(n) a. inhibitor. b. activator. c. substrate. d. coenzyme. e. cofactor

Biology & Microbiology

What type of allele is often detected as a distortion in segregation ratios, where one class of expected progeny is missing?

A) dominant negative allele B) temperature-sensitive allele C) lethal allele D) partial dominance E) incomplete penetrance

Biology & Microbiology

To strengthen the conducting cells and help plants stand erect without water for them to float in, land plants developed

A) stomata. B) a cuticle. C) flowers. D) vascular tissue. E) lignin.

Biology & Microbiology

Using the numbers 1-4, label the correct chronological sequence of events for the Gram staining procedure.(1, 2, 3, 4) Apply iodine for 1 minute to the smear and rinse.(1, 2, 3, 4) Add crystal violet for 60 seconds and rinse.(1, 2, 3, 4) Add 95% ethanol for 10-20 seconds and rinse.(1, 2, 3, 4) Apply safranin for 60 seconds and rinse.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology