Which statement below about cells is true?

A. All things are composed of cells.

B. All cells come from other cells.

C. All cells have a nucleus.

D. All cells contain organs and tissues.

What is gravitropism? How can a plant show both a positive and a negative gravitropism

A homozygous tall (dominant) pea plant is crossed with a short (recessive) plant. The probability that an F1 plant will be tall is A. 100%. B. 50%. C. 75%. D. 25%.

Based on the model of cellular transport, the hydrolysis of ATP and ADP provide a mechanism for

medical assistants to ensure the personal and physical safety of stroke and seizure patients during an office visit.

A client presents to the health care clinic with reports of a 2-day history of sore throat, ear pressure, fever, and stiff neck. The client states she has taken Tylenol and lozenges without relief.

Muscle cells differ from nerve cells mainly because they a. express different genes. b. contain different genes. c. use different genetic codes. d. have unique ribosomes.

The butterflies shown below all belong to the same species, but one of them has inherited a rare mutation for blue wings rather than orange wings. The butterflies feed on nectar from orange flowers, and their color acts as camouflage while they feed.

A normal human karytype has

Cual es el proposito de la nutricio?

Azotobacter A. forms endospores. B. forms cysts. C. fixes carbon dioxide. D. are used as an indicator of fecal pollution.