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Cloud [144]
3 years ago
11

What is the sac that must surround something before it can be actively transported across a membrane? A. Centrosome B. Chloropla

st C. Ribosome D. Vesicle
Biology
2 answers:
Nata [24]3 years ago
5 0
Pretty sure it's D.
jonny [76]3 years ago
3 0
A membranous sac that surrounds something before it is actively transported across a membrane is called a Vesicle. 

The solution is D.
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Which of the following is true regarding speciation and mechanisms of evolution?
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2 years ago
The earth liberation front (elf) is an example of what type of organization?
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8 0
3 years ago
Evesa
Artist 52 [7]

Answer:

Active uptake (which I think you mean active transport) is important when the concentration gradient is against that of a certain substance, so it doesn't cross the membrane through diffusion or passive transport. It is sometimes necessary if a substance needs to move across a membrane but can't do so due to electrical charge or that there is a substance on the other side of the membrane preventing diffusion.

Explanation:

8 0
3 years ago
When studying animal behavior, the distribution of organisms within a choice chamber can be studied to identify animal preferenc
Komok [63]

Answer:

c

Explanation:

Random distribution of the Isopods should be 50/50 in A and B.

Chi-square = \frac{(O - E)^2}{E} where O = observed frequency and E = expected frequency

Chamber         O                    E             Chi-square

  A                   18                   10             \frac{(18 - 10)^2}{10} = 6.4

  B                    2                    10             \frac{(2 - 10)^2}{10} = 6.4

<em>Total Chi-square </em>= 6.4 + 6.4 = 12.8

<em>Degree of freedom</em> = 2 - 1 = 1

<em>Tabulated Chi-square</em> (α = 0.05) = 3.8415

The calculated Chi-square exceeds the critical value, hence, it is significant and not due to random.

<em>The correct option is </em><em>c</em><em>.</em>

4 0
3 years ago
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