Which statement best explains why invertebrates often have outer skeletons but vertebrates do not?

Biology

2 answers:

quester [9]3 years ago

8 0

The outer skeleton provides protection due to the fact that invertebrates do not have backbones

kolbaska11 [484]3 years ago

8 0

Answer:

The correct answer is A or The outer skeleton provides protection, since invertebrates do not have backbones.

Explanation:

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A red blood cell with an osmolarity of 300 mOsM (non-penetrating solutes) swells but does not lyse when placed in a 300 mOsM sol

Mashcka [7]

Answer:

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Explanation:

A. 200 mOsM NaCl

This solution is hypotonic to the red blood cell (RBC) with penetrating solute. The RBCs will swell up and burst because the water will move into the cells.

B. 400 mOsM urea

This solution is hypertonic to the RBCs with non-penetrating solutes. Water will leave the cells via osmosis and the cells will shrink and appear shriveled.

C. 100 mOsM urea plus 200 mOsM NaCl

This time both penetrating and non-penetrating solute is present. The solution is isotonic to the RBCs and although there will be movement of water between the cells and the solution, there will be no overall change in the concentration of water for each and no change in appearance of the cells.

D. 300 mOsM urea

The RBCs will not lyse nor shrivel as again the solution is isotonic to the RBCs.

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2 years ago

Why would the cell theory change over time?

alexandr402 [8]

Answer:

The invention of the microscope led to the discovery of the cell by Hooke. While looking at cork, Hooke observed box-shaped structures, which he called “cells” as they reminded him of the cells, or rooms, in monasteries. This discovery led to the development of the classical cell theory.

Explanation:

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2 years ago

Why do sugar nucleotides, such as udp-glucose, play a role in glycogen synthesis, rather than sugar phosphates, such as glucose-

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<h3>What are nucleotides?</h3>

A nucleotide is the primary component of nucleic acids (RNA and DNA). A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA), a phosphate group, and a nitrogen-containing base. DNA nucleotides include adenine (A), cytosine (C), guanine (G), and thymine (T). In RNA, the nucleotide uracil (U) replaces thymine. Polymeric DNA and RNA molecules are composed of long strands of nucleotides.