During the Calvin cycle:

Which of the following statements regarding the genetic material of cells and viruses is true? A. The genes of both viruses and

mash [69]

Answer:

Option B. Viral genes may be encoded by DNA or RNA, but cellular genes are always encoded by DNA.

Explanation:

Virus is a unique organism having unique characteristics which act as both living and non living. In cell, it is living while outside the cell it is present in crystalline form. Virus is composed of two genome i. e. DNA or RNA. But cell is composed of only DNA genome. There is no nucleus present in virus. Mitochondria and ribosome are also absent.

7 0

3 years ago

What molecule makes up more than half of the human body? A. H₂ B. CO2 C. Na D. H20

marysya [2.9K]

Answer:

D

Explanation:

its scientifically proven that water covers over 70% of the human system

5 0

3 years ago

Why is it useful for an ecologist to identify the keystone species in an ecosystem?

Alik [6]

The correct answer is C. The keystone species is critical to maintaining the stability of an ecosystem, and changes in its population indicate changes in ecosystem health.

6 0

4 years ago

Read 2 more answers

Which pair is mismatched? Multiple Choice Trypanosoma - causes African sleeping sickness Giardia - transmitted by feces in drink

Grace [21]

Answer:

Trypanosoma ------------ causes Chagas disease.

Trypanosoma -------------- causes African sleeping sickness.

Giardia --------------------- transmitted by feces in drinking water.

Trichomonas ------------ sexually transmitted.

Histoplasma ------------- causes Ohio Valley fever.

Explanation:

- Trypanosoma cruzi is a parasite transmitted by the bite of an insect of the Triatominae subfamily, very common in rural areas. It causes weakening of the heart muscle and heart failure, characteristic of Chagas disease.

- Trypanosoma brucei is a hemoparasite - found in the blood - transmitted by the tse-tse fly. Causes African trypanosomiasis or African sleeping sickness, characterized by progressive involvement of the central nervous system.

- Giardia lamblia is a parasite that is predominantly found in the duodenum. Infestation by this biological agent produces abdominal pain, nausea and belching with an unpleasant taste. It is transmitted by water contaminated with feces.

- Trichomonas vaginalis is a parasite that is transmitted through sexual contact, and produces vaginal trichomoniasis, a disease that causes inflammation and secretion in the genitals of men and women.

- Histoplasma capsulatum is a fungus that produces the disease called Ohio Valley fever (histoplasmosis), characterized by cough with expectoration, respiratory distress, fever, headache and severe muscle aches.

Learn more:

Infectious disease brainly.com/question/5714458

7 0

3 years ago

_____ that are not reabsorbed drift out of the synaptic gap, through diffusion. This is how the synaptic gap is cleared, in prep

BigorU [14]

Answer;

-Nuerotransmitters

Neurotransmitters that are not reabsorbed drift out of the synaptic gap, through diffusion. This is how the synaptic gap is cleared, in preparation for the next release of a new batch of these chemical messengers.

Explanation;

-The majority of neurotransmitters drift across the synaptic gap and come into contact with receptor sites of the receiving neurons dendrites. Receptor site is the location where neurotransmitters attach on the receiving side of the synaptic gap. Because there are a variety of neurotransmitters a variety of receptor sites also exist.

-It is necessary for the right neurotransmitter to fit a corresponding receptor site to convey the message.

-When the neuro transmitters latch onto the receptors of the dendrites of the receiving neuron tiny gates in the receiving cells membrane fly open ushering positively charged particles into the cell and restarting the cycle of action potential.

-The firing of one neuron contributes to the potential for neighboring neurons to fire as a result of its chemical message. Reuptake process by which neurotransmitters are reabsorbed by the sending terminal bud. Neurotransmitters that are not reabsorb drift out of the synaptic gap through diffusion

6 0

3 years ago