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solmaris [256]
4 years ago
8

Down syndrome, the most common genetic condition in the United States, is also called trisomy 21. What does this mean?

Biology
2 answers:
Setler79 [48]4 years ago
8 0

<u>Answer:</u>

The correct answer option is C. A person with Down syndrome has three copies of chromosome 21 instead of two copies. An extra chromosome 21 was present in either the sperm or the egg cell.

<u>Explanation:</u>

Down Syndrome is the most genetic condition in the United States caused by the error in the cell division called 'disjunction'.

A normal person has two copies of chromosome 21 while a person with down syndrome has three copies of it in either the sperm or the egg which fails to separate.

77julia77 [94]4 years ago
4 0

Trisomy=3 chromosomes; 1 more than the required pair (2)

21=the type of chromosome

So, here we can eliminate A and B.

Now we have C and D.

I know that when sperm cell(s) simultaneously fertilize [an] egg, a class of identical twins will form. Therefore, we can eliminate D, leaving us with merely C. Henceforth, C is your final answer.

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The blood sugar in your body is maintained by a gland that acts as an exocrine and endocrine gland. It is the
Irina-Kira [14]

Answer:

Pancreas.

Explanation:

Pancreas is an organ that acts as both exocrine as well as endocrine gland. As exocrine gland, it secretes digestive enzymes into the small intestine that help in digestion of complex food molecules.

As an endocrine gland, it secretes glucagon (from alpha cells) and insulin (from beta cells) hormones, directly into the bloodstream. Both of these hormones are responsible for the regulation of blood sugar level in the body.

Thus, the correct answer is 'pancreas.'

8 0
3 years ago
A loopful of bacteria containing 1000 bacterial cells is inoculated into a nutrient broth and incubated. After a negligible lag
Black_prince [1.1K]

Answer:

<h2>a.  1000 X 2^8</h2>

Explanation:

As given;

Initial population of bacteria= 1000;

Log phase growth is exponential phase, period in which bacteria gets double.

Generation time= 15 minutes;

it means, bacteria get double in every 15 minute,

so after 2 hours, bacteria will have 8 generation times;

so the final generation of bacteria is =1000 X 2^8.

Final bacterial generation after two hours = 256,000(1000 X 2^8)

5 0
3 years ago
Consider this plant cell<br> H<br> G<br> F<br> D<br> E<br> Which organelle is labeled E?
hichkok12 [17]
It’s cell membrane.
4 0
3 years ago
Read 2 more answers
Which of the following correctly compares Ornithischian and Saurischian dinosaurs?
kumpel [21]

Answer:

The option c is partly correct.

Explanation:

None of the statements is completely accurate because:

a. Saurischian dinosaurs include theropod and sauropod dinosaurs, and their common ancestors. Ornithischians comprise neornithischians (ornithopods and ceratopsians), thyreophorans (ankylosaurs and stegosaurs) and heterdontosaurids.

b. Capability to fly has only been documented in fossils belonging to Saurischia (where the birds are also classified in). Feathers, on the other hand, do appear in the two clades. Feathers, however, are not a trait exclusively associated to flight.

c. This is a correct comparison between ornithischians and saurischians in the sense that the attributes do belong to these clades, but when comparing animals there most be a comparison that reflects a pattern. Ornithischians have leaf shaped teeth suited to eat plant material, whereas saurischians have teeth for a carnivore and herbivore diet.

d. Sauropods are saurischians and they evolved herbivory from a meat-eater ancestor.

5 0
3 years ago
Passive transport is the net movement of substances down a concentration gradient that requires metabolic energy. Active transpo
Dafna1 [17]

Answer:

The statement is false.

Explanation:

Passive transport moves molecules from one side of the membrane to the other with the energy of the chemical gradient (or concentration gradient). Otherwise, active transport uses the hydrolyzation of ATP to gain energy in order to move molecules across the membrane without taking into account the gradient.

4 0
4 years ago
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