In the starch test, the zone of clearing is detected by…单项选择题

A

Exposing the plate to UV light

B

Flooding the plate with iodine

C

Flooding the plate with crystal violet

D

A color change of the colonies on the plate

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A clear halo around colonies on starch agar after iodine application indicates:

Question textThis is a picture of a starch hydrolysis test, used to measure the amylase activity in plants. Amylase has been extracted from germinating barley seeds and this extract was used to determine the amylase activity by measuring the time taken to reach the achromic point. Please note that the number in the left corner of each dropwell refers to time, measured in minutes.Select the appropriate answers in the paragraph below.Amylase is a(n) Answer 1 Question 19[select: , carbohydrate, amino acid, lipid, enzyme, nucleotide] that is primarily responsible for breaking down starch to Answer 2 Question 19[select: , raffinose, glycogen, lactose, trehalose, sucrose, maltose, xylose, amylose].In the image provided, the most accurate estimate for the achromic point is Answer 3 Question 19[select: , 7 minutes, no achromic point reached, 2 minutes, 13 minutes, 8 seconds]. The subsequent Benedict’s test revealed a ‘brick red’ coloured precipitate forming from the product of the starch hydrolysis test. This confirms that the product Answer 4 Question 19[select: , is a non-reducing sugar, contains undigested starch, is a reducing sugar, is not maltose or glucose].

What is the purpose of adding enzymes to the oat slurry in the production of oat milk?  

Project A has a required return on 9.2 percent and cash flows of −$87,000, $32,600, $35,900, and $43,400 for Years 0 to 3, respectively. Project B has a required return of 12.7 percent and cash flows of −$85,000, $14,700, $21,200, and $89,800 for Years 0 to 3, respectively. Which project(s) should you accept based on net present value if the projects are mutually exclusive?

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