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Lunna [17]
3 years ago
8

Plz Help with these 5 questions

Biology
2 answers:
olchik [2.2K]3 years ago
5 0
1. C. a cloud of gas and dust.
Misha Larkins [42]3 years ago
4 0
Zzxz the answer is A cloud of gas and dust and please follow me I need a follower
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What is one defining feature of a prokaryotic cell? A. ribosomes B. Nucleus C. Flagella D. Nucleoid
Sedaia [141]

Answer:

D. Nucleoid

Explanation:

As prokaryotic cells do not have any organelles, they use a nucleoid to store their prokaryotic DNA.

4 0
3 years ago
Assume that you have 1 mL of a solution of amylase (an enzyme) at a concentration of 15 mg protein/mL. Calculate the volume of d
lidiya [134]

Answer:

42,5 mL

Explanation:

We need to use the serial dilution formula beacuse we start with a stock concentrate solution and we need to prepare a new less concentrated one.

DF=\frac{Vi}{Vf}

<u>DF in the dilution factor, Vi is the initial volume and Vf is the final volume.</u>

The first step is to have the same measurment unit so we need to convert 345 µg to mg.

we know that 1 µg equals 0,001 g, hence:

345 µg = 0,345 mg

now the final volume is 0,345 mg  protein/ mL and the inital volume is 15mg protein/mL, both of them are in the same unit so we can use the formula

DF= \frac{15mg protein/mL}{0.345mg protein/mL}

DF= 43,5 mg protein/ mL

Now since the question said that we already have 1.0mL of the amylase stock solution we need to subtract that 1.0mL to the 43,5 mg protein/mL

43,5mL-1,0mL = 42,5 mL

So, we need 42,5 mL of diluting buffer if we want a final concentration of 345 µg protein/mL (0.345 mg protein/mL)

8 0
3 years ago
What type of t cell can directly attack and kill other cells, such as virus-infected cells?.
Shalnov [3]

Answer: Effector cytotoxic T cells

Explanation:

Cells infected with a virus or another internal cellular infection are immediately killed by effector cytotoxic T cells.

3 0
2 years ago
How can friction help a car?
ddd [48]

Answer:

it helps a car slow down or pull to a stop I think

4 0
3 years ago
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How do the human abilities of hearing and sight relate to the properties of
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I need help i think the answer is6
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