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2 years ago

Please can someone help me, I’m so stuck and feel like crying

Biology

1 answer:

Bess [88]2 years ago

5 0

set the fish in somewhere to rest it on and squeeze the liquid out of the fish, then put the liquid into a test tube and mix it with water, wait and then look at it.

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!!!EASY!!! Can light cause the plastic to melt? Why or why not? Does it matter what type of light he shines on the plastic?

ella [17]

Answer:

yes if hot enough.

Explanation:

if hot enough

7 0

3 years ago

Scientists are sure that having 2 heads is only caused by a genetic mutation. true false

azamat

Answer:

I think It's true

Explanation:

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3 years ago

Scientists recently discovered that three different types of squid, a marine animal, previously thought to be three different sp

ivanzaharov [21]

Answer:

D: The DNA present in the cells of the squid.

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2 years ago

Two different enzymes catalyze the same reaction and both exhibit the same Vmax. When Enzyme A was run with a 40 uM substrate, t

Vinil7 [7]

Answer:

a) k_m = 4.08 uM

V_{max} = 20.07 uM/min

b) k_m = 8.16 uM

Explanation:

Given that:

For Enzyme A:

the substrate concentration [S] = 40 uM

the initial velocity rate v = 10 uM/min

when it was 4mM, v = 20 uM/min

i.e.

at 4mM = 4000 uM;

Using Michealis -menten equation;

when v = 10

$V = \dfrac{V_{max}[S]}{k_m+[S]}$

∴

$10 = \dfrac{V_{max}\times 40}{k_m + 40}$

$10 (k_m + 40) = V_{max}40$

$40V_{max} -10k_m = 400 --- (1)$

when v= 20

$20= \dfrac{V_{max}\times 4000}{k_m + 4000}$

$20 (k_m + 4000) = V_{max}4000$

$4000V_{max} -20k_m = 8000 --- (2)$

equating equation (1) and (2):

$40V_{max} -10k_m = 400 --- (1)$

$4000V_{max} -20k_m = 8000 --- (2)$

let multiply equation (1) by 100 and equation (2) by 1

4000V_{max} - 1000K_m = 4000

4000V_{max} - 20 k_m = 8000

0 -980k_m = 4000

k_m = 4000/-980

k_m = 4.08 uM

replacing the value of k_m into equation (1)

40{V_max } - 10(4.08) = 400

40{V_max } - 40.8 = 400

40{V_max } = 400 + 40.8

40{V_max } = 440.8

V_{max} = 440.8/40

V_{max} = 11.02 uM/min

Since V_{max} of A ie equivalent to that of B; then:

V_{max} of B = 11.02 uM/min

Here;

[S] = 80 uM

V = 10 uM/min

∴

$10 = \dfrac{11.02 \times 80}{k_m + 80 }$

10(k_m +80) = 881.6

10k_m = 881.6 - 800

10k_m = 81.6

k_m = 81.6/10

k_m = 8.16 uM

8 0

2 years ago

Adaptations of the chloroplast

zepelin [54]

Answer:

Chloroplasts are the ’solar energy plants’ of a cell – they convert light energy into chemical energy

This chemical energy may be either ATP (light dependent) or organic compounds (light independent)

Only photosynthetic tissue possess chloroplasts (e.g. is present in leaves but not roots of plants)

Chloroplasts are thought to have once been independent prokaryotes that were internalised by eukaryotes via endosymbiosis

They have a double membrane structure (due to vesicular coating as part of the endocytotic process)

They have their own DNA (circular and naked) and ribosomes (70S)

Their metabolic processes are susceptible to certain antibiotics

The structure of the chloroplast is adapted to the function it performs:

Thylakoids – flattened discs have a small internal volume to maximise hydrogen gradient upon proton accumulation

Grana – thylakoids are arranged into stacks to increase SA:Vol ratio of the thylakoid membrane

Photosystems – pigments organised into photosystems in thylakoid membrane to maximise light absorption

Stroma – central cavity that contains appropriate enzymes and a suitable pH for the Calvin cycle to occur

Lamellae – connects and separates thylakoid stacks (grana), maximising photosynthetic efficiency

Explanation:

please mark me as brainliest

7 0

2 years ago

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