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lozanna [386]
3 years ago
5

Which movement of substances through a cell membrane against a concentration gradient requires energy?

Biology
1 answer:
Alja [10]3 years ago
3 0

Answer:active transport as it's difinition state

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A scientist measures the circumference of acorns in a population of oak trees and discovers that the most common circumference i
Vinil7 [7]

Disruptive selection or diversifying selection describes the changes in population genetics where extreme values for a trait are favored over intermediate values.

So according to this definition, the conclusion can be derived as :

The most common circumference(s) to be after 10 generations of diversifying selection will be greater than 2 cm and less than 2 cm.

8 0
3 years ago
Transcribe the following DNA sequence (use a different color for the mRNA strand, and remember that RNA has uracil instead of th
Fed [463]

Answer:

C U A G C U A U G G U A A G C C G C G U A U G A A G C

Explanation:

this is the complementary strand in mRNA.

A=U

G=C

C=G

T=A

this is the answer key to any mRNA strand.

Hope this helps! :)

8 0
3 years ago
What type of candy is earths mantle most like?
professor190 [17]

Answer:

Ice cream , peanut butter or melted marshmallows with puffed rice- cereal

Explanation:

can all work for the mantle layer of your project. Push a hard candy representing both the inner core and outer core into a ball of ice cream, or spoon a layer of ice cream into a clear plastic cup over the top of the inner and outer core.

Hope it helps

5 0
2 years ago
A student has been studying electrical circuits in class. The student suggests that replacing a wire with rubber tubing will sto
-BARSIC- [3]

Answer:

A student has been studying electrical circuits in class. The student suggests that replacing a wire with rubber tubing will stop the current from flowing through a circuit. Which term best describes this idea?

Hypothesis

Explanation:

From the analogy, it is expedient to know that the student assertion about the electrical circuits was an hypothesis because it gives room for further investigation by other scholars.

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
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